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Old 13th June 2013, 07:49 AM   #61
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Hi Djim,

I don't own any NW series. I looked for it though - couldn't find any Klippel data for the NW series on the net.
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Old 13th June 2013, 01:56 PM   #62
epa is offline epa  Netherlands
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hi jim
ive looked at the imp plot of the th 221.
the first spike is around 10 hz that why it doesnt show on the graph
the second spike is around 32 ,the dip after that upwards is around 45 hz.
i dont beleave the th 221 is tuned that high.
i realy think its tuned @~25 hz,wich is about 7hz lower then fs.
the moment a driver is mass loaded ,the resonance changes right?

i'm not saying your wrong,just willing to learn
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Old 13th June 2013, 07:31 PM   #63
Djim is offline Djim  Netherlands
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Hi Erik,

You are right, I overlooked the chopped-off impedance graph at 20Hz instead of the 10Hz like the response. Also considering Josh Ricci's punishment of the same 21" and comparing the response with the 118 it must be tuned lower. Thanks for pointing out

Click the image to open in full size.
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Old 15th June 2013, 06:26 AM   #64
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Quote:
Originally Posted by Djim View Post
Like I told Crescendo a while ago, if he serious wants to go to below 30Hz, I think he should look for some serious 21" drivers.
Not that I disagree, but I don't remember the 21" suggestion.


Quote:
Originally Posted by Djim View Post
If he wants low 30ties and still with enough output reserves, I would consider dual 18"settings for TH's.
This still intrigues me...a lot.
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Old 15th June 2013, 06:48 AM   #65
epa is offline epa  Netherlands
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justin
make some room in your pm box.i have a design i like to share.
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Old 15th June 2013, 10:01 AM   #66
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Sorry bout that mate. PM'd you my email.
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Old 15th June 2013, 01:57 PM   #67
epa is offline epa  Netherlands
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its not a big secret or so,i just want to bild it myself before i go public
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Old 15th June 2013, 06:33 PM   #68
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by CRESCENDO View Post
Not that I disagree, but I don't remember the 21" suggestion.
Hi Justin,

In my e-mail from 12-4-2012 I suggested as a fourth option, to put a couple of 21" (in reflex or TH) combined with some other TH's.

But as guideline for diameter vs high efficiency you can use the following for extended LF PA drivers;
12inch = 50Hz to 55Hz for -3dB
15inch = 40Hz to 45Hz for -3dB
18inch = 33Hz to 40Hz for -3dB
21inch = 26Hz to 33Hz for -3dB

The problem of tuning very low and still want to use them all the way up to 80Hz, it is difficult to keep them efficient between 50Hz and 80Hz. It is the region where you need most energy! For that reason 21" PA systems are usually combined with other, more efficient systems.

Quote:
Originally Posted by CRESCENDO View Post
This still intrigues me...a lot.
By using a dual driver setting you increase the system efficiency and you have more reserves.

Last edited by Djim; 15th June 2013 at 06:40 PM.
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